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Continuous Glucose Monitoring - Topic Overview

What are the benefits? continued...

The alarm feature of a CGM can be set to alert you if your blood sugar is quickly going up or down, or if you have a blood sugar level out of your target range. This is helpful for people who have problems knowing when they have low blood sugar (hypoglycemic unawareness). Parents, partners, or caregivers can be alerted when your blood sugar is dropping quickly while you are asleep.

CGMs also work with some glucose meters and some work with insulin pumps.

What are the drawbacks?

  • A continuous glucose monitoring system can be expensive, and your insurance may not cover the cost. If your insurance does cover the cost, you may have to do some work to get the coverage. You may have to submit records showing how often you took blood sugar readings over a period of time, perhaps a month, and what those readings were. Ask your insurer ahead of time what is covered and what you will need to do to get that coverage.
  • Sensors last just a few days. You must insert a new one every 3 to 7 days, depending on the type.
  • CGMs don't replace finger pricks. You'll still need to prick your finger at least once or twice a day to confirm the CGM's accuracy.

Who is most likely to be successful using this device?

You're most likely to be successful with a CGM if:

  • You are committed to keeping your blood sugar under control.
  • You're willing to learn how to use the CGM.
  • You realize that finger pricks and continuing to use your standard glucose meter are still very important.
  • The idea of having the sensor attached to your body throughout the day and night doesn't bother you.
  • You see well enough to read the monitor and you hear well enough to hear the alarms.

This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

WebMD Medical Reference from Healthwise

Last Updated: June 24, 2013
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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If the level is below 70 or you are experiencing symptoms such as shaking, sweating or difficulty thinking, you will need to raise the number immediately. A quick solution is to eat a few pieces of hard candy or 1 tablespoon of sugar or honey. Recheck your numbers again in 15 minutes to see if the number has gone up. If not, repeat the steps above or call your doctor.

People who experience hypoglycemia several times in a week should call their health care provider. It's important to monitor your levels each day so you can make sure your numbers are within the range. If you are pregnant always consult with your health care provider.

Congratulations on taking steps to manage your health.

However, it's important to continue to track your numbers so that you can make lifestyle changes if needed. If you are pregnant always consult with your physician.

Your level is high if this reading was taken before eating. Aim for 70-130 before meals and less than 180 two hours after meals.

Even if your number is high, it's not too late for you to take control of your health and lower your blood sugar.

One of the first steps is to monitor your levels each day. If you are pregnant always consult with your physician.

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